blk_queue_io_min (9) - Linux Manuals
blk_queue_io_min: set minimum request size for the queue
blk_queue_io_min - set minimum request size for the queue
void blk_queue_io_min(struct request_queue
* q, unsigned int min);
- the request queue for the device
- smallest I/O size in bytes
Storage devices may report a granularity or preferred minimum I/O size which is the smallest request the device can perform without incurring a performance penalty. For disk drives this is often the physical block size. For RAID arrays it is often the stripe chunk size. A properly aligned multiple of minimum_io_size is the preferred request size for workloads where a high number of I/O operations is desired.